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  /**
   * Setup all visualization elements when the page is loaded. 
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  function init() {
    // Connect to ROS.
    var ros = new ROSLIB.Ros({
      url : 'ws://localhost:9090'
    });

    // Create the main viewer.
    var viewer = new ROS3D.Viewer({
      divID : 'markers',
      width : 800,
      height : 600,
      antialias : true,
      alpha : 0.5
    });

    // Setup a client to listen to TFs.
    var tfClient = new ROSLIB.TFClient({
      ros : ros,
      angularThres : 0.01,
      transThres : 0.01,
      rate : 10.0,
      fixedFrame : '/rotating_frame'
    });

    // Setup the marker client.
    var imClient = new ROS3D.InteractiveMarkerClient({
      ros : ros,
      tfClient : tfClient,
      topic : '/basic_controls',
      camera : viewer.camera,
      rootObject : viewer.selectableObjects
    });
  }
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<body onload="init()">
  <h1>Simple Interactive Marker Example</h1>
  <p>Run the following commands in the terminal then refresh this page.</p>
  <ol>
    <li><tt>roscore</tt></li>
    <li><tt>rosrun interactive_marker_tutorials basic_controls</tt></li>
    <li><tt>rosrun interactive_marker_proxy proxy topic_ns:=/basic_controls
        target_frame:=/rotating_frame</tt></li>
    <li><tt>rosrun tf2_web_republisher tf2_web_republisher</tt></li>
    <li><tt>roslaunch rosbridge_server rosbridge_websocket.launch</tt></li>
  </ol>
  <div id="markers"></div>
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